U.S. patent application number 15/324279 was filed with the patent office on 2017-07-13 for rotor of rotating motor, rotating motor, and air-conditioning apparatus.
The applicant listed for this patent is Mitsubishi Electric Corporation. Invention is credited to Ryo NABIKA, Hironori YABUUCHI, Takashi YAMAGUCHI, Hiroshi YAMANAKA.
Application Number | 20170201153 15/324279 |
Document ID | / |
Family ID | 55760443 |
Filed Date | 2017-07-13 |
United States Patent
Application |
20170201153 |
Kind Code |
A1 |
YAMANAKA; Hiroshi ; et
al. |
July 13, 2017 |
ROTOR OF ROTATING MOTOR, ROTATING MOTOR, AND AIR-CONDITIONING
APPARATUS
Abstract
A rotor of a rotating motor includes a boss into which a shaft
is inserted, a rotor yoke provided on a side of an outer
circumference of the boss and formed of a plurality of pole pieces
connected into a circular ring shape, and a coupling member made of
resin with which the boss and the rotor yoke are integrally molded.
Each of the plurality of pole pieces is provided with an injection
hole that is bored in an axial direction and into which the resin
is injected in the integral molding.
Inventors: |
YAMANAKA; Hiroshi; (Tokyo,
JP) ; YABUUCHI; Hironori; (Tokyo, JP) ;
NABIKA; Ryo; (Tokyo, JP) ; YAMAGUCHI; Takashi;
(Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Mitsubishi Electric Corporation |
Tokyo |
|
JP |
|
|
Family ID: |
55760443 |
Appl. No.: |
15/324279 |
Filed: |
October 22, 2014 |
PCT Filed: |
October 22, 2014 |
PCT NO: |
PCT/JP2014/078060 |
371 Date: |
January 6, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02K 1/30 20130101; H02K
7/14 20130101; H02K 7/04 20130101; F24F 1/0007 20130101 |
International
Class: |
H02K 7/04 20060101
H02K007/04; F24F 1/00 20060101 F24F001/00; H02K 7/14 20060101
H02K007/14 |
Claims
1. A rotor of a rotating motor, comprising: a boss into which a
shaft is inserted; a rotor yoke provided on a side of an outer
circumference of the boss and formed of a plurality of pole pieces
connected into a circular ring shape; and a coupling member made of
resin with which the boss and the rotor yoke are integrally molded,
each of the plurality of pole pieces being provided with an
injection hole that is bored in an axial direction and into which
the resin is injected in the integral molding each of the plurality
of pole pieces being formed of a plurality of sheets stacked on
each other, the plurality of sheets each having a swaged portion,
the plurality of sheets being fixed at the swaged portions, the
injection hole being provided on a side of an outer circumference
of each of the swaged portions, the coupling member including a
joint portion provided at least on a side of an inner circumference
of the rotor yoke, and configured to join an outer circumferential
surface of the boss and an inner circumferential surface of the
rotor yoke, in the injection hole, the resin being injected.
2. (canceled)
3. The rotor of a rotating motor of claim 1, wherein each of the
plurality of sheets forming each of the plurality of pole pieces
includes a plurality of the swaged portions, and each of the
plurality of pole pieces includes a plurality of the injection
holes each provided at each of a plurality of positions.
4. The rotor of a rotating motor of claim 1, wherein the swaged
portion and the injection hole are aligned in a radial direction of
the rotor yoke.
5. The rotor of a rotating motor of claim 1, wherein the boss is
formed of a plurality of sheets stacked on each other and fixed
together, and the plurality of sheets of each of the plurality of
pole pieces and the plurality of sheets of the boss have different
thicknesses.
6. The rotor of a rotating motor of claim 1, wherein the coupling
member includes a covering portion extending from each end portion
of the joint portion in the axial direction to cover an end surface
of the rotor yoke in the axial direction, and the covering portion
is coupled to the resin in the injection hole.
7. The rotor of a rotating motor of claim 1, wherein the joint
portion is formed to have a uniform thickness from the boss to the
rotor yoke.
8. The rotor of a rotating motor of claim 1, wherein the resin
comprises thermoplastic resin or thermosetting resin.
9. A rotating motor comprising: the rotor of claim 1; the shaft
inserted into the boss; and a magnet provided on an outer
circumferential surface of the rotor yoke.
10. An air-conditioning apparatus comprising: the rotating motor of
claim 9; and a propeller fan mounted on the rotating motor.
Description
TECHNICAL FIELD
[0001] The present invention relates to a rotor of a rotating motor
mounted on various types of electric apparatuses, a rotating motor,
and an air-conditioning apparatus.
BACKGROUND ART
[0002] For devices such as a fan motor in an outdoor unit of an
air-conditioning apparatus, the efficiency has been enhanced in
response to a demand for energy saving, and AC motors have been
increasingly replaced with brushless DC motors. The brushless DC
motor employs a configuration in which, to avoid electrical
corrosion of a bearing due to current caused at a shaft as an axis,
a rotor core of a rotating motor is divided into inner and outer
cores, and an elastic body is inserted into an annular clearance
left between the inner and outer cores (for example, Patent
Literature 1).
[0003] Circular ring-shaped iron core pieces forming the outer core
in Patent Literature 1 are formed by continuously punching out the
iron core pieces from a band-shaped steel sheet material, leading
to a poor material yield rate. For this reason, for a core
structure of the rotating motor, a method has been also employed in
which concave and convex portions provided at end surfaces of
adjacent ones of a plurality of fan-shaped divided cores in the
circumferential direction of the divided cores are fitted together,
and then, an annular rotor iron core is integrally formed using an
elastic body (for example, Patent Literature 2).
CITATION LIST
Patent Literature
[0004] Patent Literature 1: Japanese Unexamined Patent Application
Publication No. 2009-130966
[0005] Patent Literature 2: Japanese Unexamined Patent Application
Publication No. 2002-262496
SUMMARY OF INVENTION
Technical Problem
[0006] However, when the fan-shaped divided cores are combined
together and the annular rotor iron core is integrally formed using
the elastic body made of resin as described in Patent Literature 2,
cylindrical accuracy of a rotor yoke is lowered due to contraction
of the elastic body in integral molding, leading to poor rotation
balance of the rotor, Thus, this unstable rotation causes vibration
and noise.
[0007] The present invention has been made in view of the
above-described problems, and is intended to provide a rotor of a
rotating motor capable of reducing rotor deformation due to resin
contraction in integral molding, a rotating motor, and an
air-conditioning apparatus.
Solution to Problem
[0008] A rotor of a rotating motor of an embodiment of the present
invention includes a boss into which a shaft is inserted, a rotor
yoke provided on a side of an outer circumference of the boss and
formed of a plurality of pole pieces connected into a circular ring
shape, and a coupling member made of resin with which the boss and
the rotor yoke are integrally molded. Each of the plurality of pole
pieces is provided with an injection hole that is bored in an axial
direction and into which the resin is injected in the integral
molding.
Advantageous Effects of Invention
[0009] In the embodiment of the present invention, each of the
plurality of pole pieces constituting the rotor yoke is provided
with the injection hole bored in the axial direction, and the resin
is injected into the injection hole in integral molding of the boss
and the rotor yoke. Thus, in integral molding, not only stress due
to resin contraction on a side of an inner diameter but also stress
due to contraction of resin filling the injection hole act on each
of the plurality of pole pieces. Consequently, deformation of the
rotor due to resin contraction of the coupling member can be
reduced.
BRIEF DESCRIPTION OF DRAWINGS
[0010] FIG. 1 is a schematic end view of a rotating motor of
Embodiment of the present invention.
[0011] FIG. 2A is a perspective view in the state in which magnets
are bonded to the circumference of a rotor of FIG. 1 and a shaft is
inserted.
[0012] FIG. 2B is a schematic end view of the rotor in the state of
FIG. 2A.
[0013] FIG. 3A is a perspective view of the rotor of FIG. 1.
[0014] FIG. 3B is a plan view of the rotor of FIG. 3A.
[0015] FIG. 4A is a perspective view of a boss as an
inner-diameter-side iron core of the rotor of FIG. 3A.
[0016] FIG. 4B is a plan view of the boss of FIG. 4A.
[0017] FIG. 5 is a view for describing a punching pattern of a
sheet for formation of the boss of FIG. 4A.
[0018] FIG. 6A is a perspective view of a rotor yoke as an
outer-diameter-side iron core of the rotor of FIG. 3A.
[0019] FIG. 6B is a plan view of the rotor yoke of FIG. 6A.
[0020] FIG. 7 is a perspective view of a pole piece forming the
rotor yoke of FIG. 6A.
[0021] FIG. 8 is a view for describing a punching pattern of a
sheet for formation of the pole piece of FIG. 7.
[0022] FIG. 9 is a schematic sectional view along A-A line of FIG.
3B.
[0023] FIG. 10 is a schematic view in the state in which a
propeller fan as a driven machine is coupled to the rotating motor
of FIG. 1.
DESCRIPTION OF EMBODIMENTS
Embodiment
[0024] FIG. 1 illustrates a rotating motor 1 of Embodiment. As
illustrated in FIG. 1, the rotating motor 1 is formed of, for
example, a brushless DC motor, and includes a cylindrical stator 2,
a rotor 3 as a rotor iron core, a motor housing 5 in which a
housing space housing the rotor 3 is formed, and a printed circuit
board 12 on which a hall element configured to detect the magnetic
pole position of the rotor 3 is mounted.
[0025] Although the illustration is omitted in FIG. 1, the stator 2
includes stator pole pieces each formed of a plurality of magnetic
steel sheets stacked on each other, coils through which current
supplied from a power source flows, and insulators provided at the
stator pole pieces and utilized for insulation of the coils. The
stator 2 is formed of the stator pole pieces, each attached with
the insulator, arranged into a circular ring shape. The coil is
wound around the stator pole piece attached with the insulator. A
casing 6 is formed of mold resin injected into a preset-shaped mold
in which the stator 2 is placed.
[0026] The motor housing 5 includes the cylindrical casing 6 with a
closed bottom, and a bracket cover 11 having a bearing housing 7
and a metal plate cover 10. An opening of the casing 6 is covered
with the bearing housing 7 and the metal plate cover 10. The motor
housing 5 is integrally fixed using mold resin in the state in
which an inner circumferential surface of the stator 2 is exposed
at an inner surface of the casing 6. Also, the motor housing 5 is
provided with a first bearing 9a and a second bearing 9b. The first
bearing 9a is attached to a bottom wall portion 16 of the casing 6,
and the second bearing 9b is attached to the bearing housing 7. The
casing 6 and the bearing housing 7 are formed of mold resin
including, for example, thermosetting resin such as unsaturated
polyester.
[0027] The rotor 3 is, on the inner side of the cylindrical stator
2 in the radial direction of the cylindrical stator 2, disposed
concentrically with the stator 2. The rotor 3 is fixed by
press-fitting a shaft 8 into the rotor 3, and the shaft 8 is
rotatably supported by the motor housing 5 through the first
bearing 9a and the second bearing 9b. The printed circuit board 12
is, by, for example, welding, fixed to a board holder 13 disposed
between an end surface of the rotor 3 and the bearing housing
7.
[0028] FIGS. 2A and 2B are a perspective view and a schematic end
view in the state in which magnets 20 are bonded to the
circumference of the rotor 3 and the shaft 8 is inserted. FIGS. 3A
and 3B are a perspective view and a plan view of the rotor 3. The
rotor 3 includes a boss 18 that is an inner-diameter-side iron core
and into which the shaft 8 is inserted, a rotor yoke 17 provided on
a side of an outer circumference of the boss 18 and formed of a
plurality of pole pieces 4 connected into a circular ring shape,
and a coupling member 19 made of resin with which the boss 18 and
the rotor yoke 17 are integrally molded.
[0029] The magnets 20 that are permanent magnets are bonded to an
outer circumferential surface of the rotor yoke 17. The magnets 20
are, using a jig (not shown), bonded to the outer circumferential
surface of the rotor yoke 17 at predetermined pitches. An adhesive,
for example, is used for bonding the magnets 20. The boss 18 is
thinner than the rotor yoke 17. The center position of the rotor
yoke 17 and the center position of the boss 18 are arranged at the
same position in an axial direction. The rotor yoke 17 is provided
with positioning holes 45 used for positioning in integral molding
of the rotor yoke 17 and the boss 18.
[0030] FIGS. 4A and 4B are a perspective view and a plan view of an
example of the boss 18 as the inner-diameter-side iron core of the
rotor 3. The boss 18 has a smaller outer diameter than the inner
diameter of the rotor yoke, and is provided with a plurality of
trapezoidal boss holes 18a. Boring the boss holes 18a reduces the
weight of the boss 18, and consequently, the inertia moment of the
rotor 3 can be reduced. Also, the boss 18 has an outer
circumferential surface having a plurality of concave portions 18b.
Note that FIGS. 4A and 4B illustrate the example where the four
boss holes 18a are each provided at a separate position and the ten
concave portions 18b are each provided at a separate position.
[0031] FIG. 5 is a view for describing a punching pattern of a
sheet for formation of the boss 18. In FIG. 5, a boss core sheet 25
is a sheet for formation of the boss 18. That is, the boss 18 is a
multi-layer iron core formed by punching out a plurality of boss
sheet pieces 25a from the boss core sheet 25 by a mold (not shown),
stacking the plurality of boss sheet pieces 25a on each other, and
fixing the plurality of boss sheet pieces 25a together at swaged
portions 18c. The boss 18 has a center portion having an insertion
hole 18d into which the shaft 8 is inserted.
[0032] FIGS. 6A and 6B are a perspective view and a plan view of
the rotor yoke 17 as an outer-diameter-side iron core of the rotor
3. FIG. 7 is a perspective view of the pole piece 4 forming the
rotor yoke 17 of the side of the outer diameter. The rotor yoke 17
is formed of the plurality of pole pieces 4.
[0033] Each pole piece 4 is a multi-layer iron core formed by
stacking a plurality of sheets having swaged portions 46 on each
other in the axial direction of the shaft 8 and fixing the
plurality of sheets at the swaged portions 46. Each pole piece 4
has an inner-diameter-side surface 4a having an inner-diameter-side
convex portion 41. Also, the pole piece 4 has a first side end
surface 4b having a convex portion 42, and a second side end
surface 4c having a concave portion 43. Also, the pole piece 4 has
end surfaces 4d and 4e having injection holes 44 bored in the axial
direction of the shaft 8 (a stacking direction) and the positioning
hole 45 for positioning the rotor yoke 17. That is, the rotor yoke
17 is formed of the plurality of pole pieces 4 (for example, ten
pole pieces 4) connected into a circular ring shape in a
circumferential direction. Specifically, the convex portion 42 and
the concave portion 43 of adjacent ones of the pole pieces 4 engage
with each other to connect the pole pieces 4 into the circular ring
shape. Thus, the swaged portions 46 are, as a whole, arranged in a
circular ring shape.
[0034] Each injection hole 44 is a through-hole, for example. In
particular, in the rotor yoke 17, each injection hole 44 is
provided on a side of the outer circumference of each swaged
portion 46. When the rotor yoke 17 and the boss 18 are integrally
molded, resin forming the coupling member 19 is injected in each
injection hole 44. As each injection hole 44 is provided on the
side of the outer diameter of each swaged portion 46, the position
of each swaged portion 46 serves as the point of support in a
contraction balance between resin on the side of the inner diameter
of the rotor yoke 17 and resin injected in each injection hole 44,
and consequently, the cylindricality of the rotor 3 can be
improved.
[0035] For a positional relation between the injection holes 44 and
the swaged portions 46, the center of each injection hole 44 is
only required to be positioned on the side of the outer
circumference of the center of each swaged portion 46. Also, the
number of injection holes 44 and the number of swaged portions 46
may be set arbitrarily, and these numbers are not necessarily equal
to each other. For example, a single injection hole 44 and a single
swaged portion 46 may be provided at a center portion of the pole
piece 4. Alternatively, an oval injection hole extending along the
circumferential direction of the pole piece 4 may be provided for a
plurality of swaged portions 46, or a different number of pole
pieces 4 from the number of swaged portions 46 may be provided in a
balanced manner. Note that the injection holes 44 are not
necessarily positioned on the side of the outer circumference of
the swaged portions 46.
[0036] The injection holes 44 and the swaged portions 46 are each
provided between the center of the pole piece 4 and each of the
convex portion 42 and the concave portion 43, and the injection
hole 44 and the swaged portion 46 are provided on the same line in
the radial direction of the rotor yoke 17. With such a
configuration, each swaged portion 46 more effectively serves as
the point of support in the contraction balance between the resin
on the side of the inner diameter of the rotor yoke 17 and the
resin injected in each injection hole 44, and consequently,
lowering of the accuracy of the shape of the rotor 3 can be
reliably reduced.
[0037] FIG. 8 is a view for describing a punching pattern of a
sheet for formation of the pole piece 4. A pole piece core sheet 24
is illustrated as a sheet for formation of the rotor yoke 17. That
is, the pole piece 4 is formed by punching out a plurality of pole
piece sheet pieces 24a from the pole piece core sheet 24 by a mold
(not shown), stacking the plurality of pole piece sheet pieces 24a
on each other, and fixing the plurality of pole piece sheet pieces
24a at the swaged portions 46. The rotor yoke 17 is formed of the
pole pieces 4 combined together. The pole piece sheet pieces 24a
are each in an arc shape. The pole piece sheet pieces 24a can be
continuously punched out from the pole piece core sheet 24, and
thus, the material yield rate of the rotor 3 can be improved.
[0038] As the boss core sheet 25 of FIG. 5 and the pole piece core
sheet 24 of FIG. 8 can be separate sheets, the material and
thickness of each of the boss core sheet 25 and the pole piece core
sheet 24 can be optionally changed. That is, the boss core sheet 25
and the pole piece core sheet 24 made of different materials and
having different thicknesses can be optionally employed. Combining
the rotor yoke 17 and the boss 18 made of different materials or
having different strengths or other characteristics can form the
rotor 3 based on design contents.
[0039] FIG. 9 is a schematic sectional view along A-A line of FIG.
3B. The coupling member 19 is made of resin, and is configured to
couple the pole pieces 4 and the boss 18 together, The coupling
member 19 is integrally molded (mold formation) to cover the swaged
portions 46 and the injection holes 44. The coupling member 19
includes joint portions 19a joining between an outer
circumferential surface 18x of the boss 18 and the
inner-diameter-side surface 4a of each pole piece 4 as an inner
circumferential surface of the rotor yoke 17. The coupling member
19 further includes a first covering portion 19d and a second
covering portion 19e each extending from a first end portion 19b
and a second end portion 19c that are end portions of the joint
portion 19a in the axial direction and each covering the end
surface 4d and the end surface 4e that are the end surfaces in the
axial direction of the rotor yoke 17. The first covering portion
19d and the second covering portion 19e are coupled with the resin
in the injection hole 44. The joint portion 19a is formed to have a
uniform thickness between the boss 18 and the rotor yoke 17. The
coupling member 19 includes ribs 19f radially arranged at equal
intervals (see FIG. 3A).
[0040] The coupling member 19 is molded to cover the swaged
portions 46 and the injection holes 44 provided on sides of
connection portions C (see FIG. 6A) of each pole piece 4 forming
the rotor yoke 17. On the other hand, the coupling member 19 is in
such a shape that each positioning hole 45 into which a positioning
pin is inserted in integral molding is exposed. Also, the coupling
member 19 couples the rotor yoke 17 and the boss 18 so that each
inner-diameter-side convex portion 41 (see FIG. 6A) of the rotor
yoke 17 faces a corresponding one of the concave portions 18b of
the boss 18. As the rotor yoke 17 and the boss 18 are integrally
molded with each inner-diameter-side convex portion 41 facing a
corresponding one of the concave portions 18b, strength against
rotation is added to the rotor 3 and the rotating motor 1 is
stabilized.
[0041] As illustrated in FIG. 9, in mold formation, the resin
forming the coupling member 19 not only flows between the rotor
yoke 17 and the boss 18, but also flows into the injection holes
44. Thus, the coupling member 19 is formed to sandwich the swaged
portions 46 from the sides of the inner and outer diameters. In
particular, in Embodiment, as the injection holes 44 and the swaged
portions 46 are provided at two positions on the sides of the
connection portions C of each pole piece 4, the coupling member 19
is formed to surround the swaged portions 46 from the sides of the
inner and outer diameters.
[0042] In integral molding of the rotor 3 in Embodiment,
contraction of the resin forming the coupling member 19 provides
contraction pressure not only on the side of the inner diameter of
the swaged portions 46 of the rotor yoke 17 but also the side of
the outer diameter of the swaged portions 46 of the rotor yoke 17.
Thus, lowering of the cylindricality of the outer diameter of the
rotor yoke 17 due to resin contraction can be reduced. Note that,
in FIG. 9, the case where each injection hole 44 penetrates in the
axial direction has been described, but the present invention is
not limited to such a case. Each injection hole 44 may be bored as
a hole axially extending from at least one of the end surfaces 4d
and 4e of the rotor yoke 17 that are the end surfaces in the axial
direction of the rotor yoke 17.
[0043] Also, the coupling member 19 is provided with
non-penetrating holes each surrounded by the joint portion 19a and
the ribs 19f. That is, the joint portion 19a does not penetrate,
and has the uniform thickness, As a result, the thickness of the
coupling member 19 is uniform. With this configuration, imbalance
contraction of the coupling member 19 made of resin is reduced, and
molding can be stabilized.
[0044] FIG. 10 is a schematic view in the state in which a
propeller fan 50 as a driven machine of the rotating motor 1 is
coupled. That is, an air-conditioning apparatus 100 of Embodiment
at least includes the propeller fan 50 of an outdoor unit and the
rotating motor 1 configured to drive the propeller fan 50. A tip
end portion of the shaft 8 is coupled to the propeller fan 50, and
the propeller fan 50 is used as a fan configured to send air to a
heat exchanger. Note that, in Embodiment, the propeller fan 50 has
been described as an example, but the present invention is not
limited to the propeller fan 50. A fan of another type based on the
intended use may be employed. That is, a sirocco fan or a turbo fan
may be employed instead of the propeller fan 50, for example.
Advantageous Effects of Embodiment
[0045] In the configuration in Embodiment, the injection holes 44
are provided on the side of the outer diameter of the swaged
portions 46 of each pole piece 4 that is a divided piece of the
circular ring-shaped rotor yoke 17 in the rotor 3 formed by
integral molding of the rotor yoke 17 and the boss 18 with resin,
and the resin flows into the injection holes 44 in integral
molding. Thus, not only stress due to resin contraction on the side
of the inner diameter but also stress due to contraction of resin
filling the injection holes 44 act on each pole piece 4 in integral
molding. For this reason, excessive contraction deformation in the
outer diameter cross section of the rotor yoke 17 is reduced, and
the cylindricality of the rotor 3 can be improved.
[0046] In the case where the injection holes 44 are provided on the
side of the outer circumference of the swaged portions 46, the
position of each swaged portion 46 serves as the point of support
in the contraction balance between resin on the side of the inner
diameter of the rotor yoke 17 and resin injected in the injection
holes 44, and consequently, cylindrical accuracy of the rotor yoke
17 can be improved. That is, the influence of resin contraction can
be reduced in integral molding with resin, and lowering of the
cylindricality of the rotor 3 can be reduced. Thus, a risk due to
divided core formation can be avoided, and a material cost can be
reduced.
[0047] In addition, as the coupling member 19 is interposed between
the rotor yoke 17 and the boss 18, the rotor yoke 17 and the shaft
8 are insulated from each other. Thus, a current generated at the
rotor yoke 17 is not transmitted to an output shaft, and occurrence
of electrical corrosion of a bearing, for example, resulting in
noise can be reduced. Consequently, the material cost of the rotor
3 of the rotating motor 1 can be reduced, and a rotor of a rotating
motor and an air-conditioning apparatus that are inexpensive and
highly accurate can be provided.
[0048] Note that Embodiment described above includes preferable
specific examples of the rotor of a rotating motor, the rotating
motor, and the air-conditioning apparatus, and may be subjected to
various technically-preferable limitations. However, the technical
scope of the present invention is not limited to Embodiment as long
as the present invention is not specifically limited by
description. For example, the example where the pole piece 4 has,
at two positions, the injection holes 44 and the swaged portions 46
is shown in FIG. 7, but the number and shape of swaged portions and
the number and shape of the injection holes may be optionally
changed depending on design contents. That is, the swaged portion
46 may be in a circular shape, and the injection hole 44 may be in
a rectangular shape. Also, the position of each injection hole 44
is not limited to the position illustrated in FIG. 7, and the
configuration can be broadly employed in which the center of the
injection hole 44 is disposed on the side of the outer diameter of
the center position of the swaged portion 46.
[0049] In FIG. 7, the case where the inner-diameter-side convex
portion 41 is formed on the side of the inner diameter of the pole
piece 4 has been described as an example, but the present invention
is not limited to such a case. Instead of the inner-diameter-side
convex portion 41, a male dovetail groove may be formed. Also, the
rotor yoke 17 in FIG. 6A includes a combination of ten pole pieces
4, but any number of pole pieces may be combined together to form
the rotor yoke.
[0050] In Embodiment, the example where the coupling member 19 is
in a flower shape covering the injection holes 44 and the swaged
portions 46 has been described, but the present invention is not
limited to such a shape. For example, the coupling member 19 may be
formed to cover an entire portion (an entire end surface in the
stacking direction) except for the positioning holes 45, or may be
formed to cover the injection holes 44 and the swaged portions 46
or cover only the injection holes 44. Also, the injection hole 44
may be, as described above, in a shape penetrating the rotor yoke
17 in the axial direction as illustrated in FIG. 9, or may be a
hole bored to axially extend from each end surface in the axial
direction of the rotor yoke 17. That is, the coupling member 19 may
be in such a shape that resin at each end surface in the axial
direction of the rotor yoke 17 is coupled with resin in the
injection holes 44. In addition, in Embodiment, thermoplastic resin
is employed as mold formation resin for the coupling member 19, but
thermosetting resin may be employed.
REFERENCE SIGNS LIST
[0051] 1 rotating motor, 2 stator, 3 rotor, 4 pole piece, 4a
inner-diameter-side surface, 4b first side end surface, 4c second
side end surface, 4d, 4e end surface, 5 motor housing, 6 casing, 7
bearing housing, 8 shaft, 9a first bearing, 9b second bearing, 10
metal plate cover, 11 bracket cover, 12 printed circuit board, 13
board holder, 16 bottom wall portion, 17 rotor yoke, 18 boss, 18a
boss hole, 18b concave portion, 18c swaged portion, 18d insertion
hole, 18x outer circumferential surface, 19 coupling member, 19a
joint portion, 19b first end portion, 19c second end portion, 19d
first covering portion, 19e second covering portion, 19f rib, 20
magnet, 24 pole piece core sheet, 24a pole piece sheet piece, 25
boss core sheet, 25a boss sheet piece, 41 inner-diameter-side
convex portion, 42 convex portion, 43 concave portion, 44 injection
hole, 45 positioning hole, 46 swaged portion, 50 propeller fan, 100
air-conditioning apparatus
* * * * *